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Millimeter-Wave Time-Resolved Studies of Chemical and Physical Interactions Between Molecular Ions, Neutrals, and Electrons

Oesterling, Lee Clifford
http://rave.ohiolink.edu/etdc/view?acc_num=osu1250393069

Abstract Details

2009, Doctor of Philosophy, Ohio State University, Chemical Physics.
We constructed a novel spectroscopic system to study rotationally inelastic collisions involving truly thermal molecular ions at low temperatures. This system utilizes magnetic confinement to generate abundant concentrations of ions and time-resolved double resonance (pump-probe) techniques to study rotational energy transfer. With this system, we studied chemical and physical processes involving HCO+ and CO+ molecular ions in gas mixtures containing hydrogen and carbon monoxide. We measured the relaxation cross section for the J=2 state of HCO+ in collisions with normal hydrogen at temperatures around 40 K and 77 K. The cross sections at the lower temperature are slightly below those predicted by Langevin theory, while those at the higher temperature are in good agreement with this theory. This dissertation discusses the discrepancy of the acquired data with Langevin theory at lower temperatures. We also performed rotational energy level spectroscopic studies of the methyl formate and symmetric mono-deuterated methyl formate molecules. We developed a rho-axis method (RAM) analysis to accurately model the rotational-torsional spectrum for the ground torsional state. In this work, we report the first measurement and analysis of millimeter-wave (mmw) and submillimeter-wave (submmw) rotational-torsional transitions for mono-deuterated methyl formate. Additionally, we extended the spectral analysis of methyl formate to higher angular momentum and higher spectral frequencies than previously reported.
Frank De Lucia, PhD (Advisor)
James Coe, PhD (Committee Member)
Linn Van Woerkom, PhD (Committee Member)
248 p.
Physics
time-resolved spectroscopy; molecular ions; rotational energy transfer; millimeter-wave

Recommended Citations

Citations

  • Oesterling, L. C. (2009). Millimeter-Wave Time-Resolved Studies of Chemical and Physical Interactions Between Molecular Ions, Neutrals, and Electrons [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250393069

    APA Style (7th edition)

  • Oesterling, Lee. Millimeter-Wave Time-Resolved Studies of Chemical and Physical Interactions Between Molecular Ions, Neutrals, and Electrons. 2009. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1250393069.

    MLA Style (8th edition)

  • Oesterling, Lee. "Millimeter-Wave Time-Resolved Studies of Chemical and Physical Interactions Between Molecular Ions, Neutrals, and Electrons." Doctoral dissertation, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250393069

    Chicago Manual of Style (17th edition)

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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.